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SHORT-TERM AND LONG-TERM DEBT (Tables)
 9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Borrowings Outstanding and Available under the Commercial Paper Programs
The amount of borrowings outstanding and available under the commercial paper programs were as follows:
Borrowings Outstanding as ofAvailable Borrowing Capacity as ofWeighted-Average Interest Rate as of
September 30, 2025December 31, 2024September 30, 2025December 31, 2024September 30, 2025December 31, 2024
(Millions of Dollars)
Eversource Parent Commercial Paper Program $1,038.5 $1,538.0 $961.5 $462.0 4.50 %4.76 %
NSTAR Electric Commercial Paper Program 479.0 504.8 171.0 145.2 4.30 %4.55 %
Summary of Long-Term Debt Issuance and Repayments The following table summarizes long-term debt issuances and repayments:
(Millions of Dollars)Interest RateIssuance/(Repayment)Issue Date or Repayment DateMaturity DateUse of Proceeds for Issuance/
Repayment Information
CL&P Series A First Mortgage Bonds4.95 %$400.0 January 2025January 2030Repaid short-term debt, paid capital expenditures and working capital
NSTAR Electric Debentures4.85 %400.0 February 2025March 2030
Repay 3.25% Debentures at maturity, repaid short-term debt, paid capital expenditures and working capital
NSTAR Electric Debentures5.20 %400.0 February 2025March 2035
Repay 3.25% Debentures at maturity, repaid short-term debt, paid capital expenditures and working capital
NSTAR Electric Debentures5.20 %300.0 October 2025March 2035Repaid short-term debt, paid capital expenditures and working capital
PSNH Series Y First Mortgage Bonds4.40 %300.0 June 2025July 2028Repaid short-term debt, paid capital expenditures and working capital
Eversource Parent Series HH Senior Notes4.45 %600.0 October 2025December 2030Repay Series J bonds at maturity and repaid short-term debt
Eversource Parent Series H Senior Notes3.15 %(300.0)January 2025January 2025Paid at maturity
Eversource Parent Series Q Senior Notes 0.80 %(300.0)August 2025August 2025Paid at maturity
NSTAR Gas Series Y First Mortgage Bonds4.86 %205.0 June 2025June 2030Repaid short-term debt, paid capital expenditures and working capital
NSTAR Gas Series Z First Mortgage Bonds5.30 %20.0 June 2025June 2035Repaid short-term debt, paid capital expenditures and working capital
NSTAR Gas Series R First Mortgage Bonds2.33 %(75.0)May 2025May 2025Paid at maturity
Yankee Gas Series Y First Mortgage Bonds5.02 %148.0 July 2025January 2031Repaid Series M bonds at maturity, repaid short-term debt, paid capital expenditures and working capital
Yankee Gas Series Z First Mortgage Bonds5.55 %37.0 July 2025July 2035Repaid Series M bonds at maturity, repaid short-term debt, paid capital expenditures and working capital
Yankee Gas Series M First Mortgage Bonds3.35 %(75.0)September 2025September 2025Paid at maturity
EGMA Series F First Mortgage Bonds4.77 %125.0 September 2025October 2030Repaid short-term debt, paid capital expenditures and working capital